/* Copyright (C) 2014 InfiniDB, Inc.
   Copyright (C) 2019 MariaDB Corporation

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; version 2 of
   the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301, USA. */

/****************************************************************************
 * $Id: func_exp.cpp 3495 2013-01-21 14:09:51Z rdempsey $
 *
 *
 ****************************************************************************/

#include <cstdlib>
#include <string>
#include <cerrno>
using namespace std;

#include "functor_real.h"
#include "functioncolumn.h"
using namespace execplan;

#include "rowgroup.h"
using namespace rowgroup;

#include "errorcodes.h"
#include "idberrorinfo.h"
#include "errorids.h"
using namespace logging;

namespace funcexp
{
CalpontSystemCatalog::ColType Func_exp::operationType(FunctionParm& fp,
                                                      CalpontSystemCatalog::ColType& resultType)
{
  // operation type is not used by this functor
  return fp[0]->data()->resultType();
}

double Func_exp::getDoubleVal(Row& row, FunctionParm& parm, bool& isNull, CalpontSystemCatalog::ColType&)
{
  // null value is indicated by isNull
  double x = parm[0]->data()->getDoubleVal(row, isNull);
  double ret = 0.0;

  if (!isNull)
  {
    errno = 0;
    ret = exp(x);

    if (errno == ERANGE)  // display NULL for out range value
    {
      if (x > 0)
      {
        isNull = true;
        Message::Args args;
        args.add("exp");
        args.add(x);
        unsigned errcode = ERR_FUNC_OUT_OF_RANGE_RESULT;
        throw IDBExcept(IDBErrorInfo::instance()->errorMsg(errcode, args), errcode);
      }
      else
        ret = 0.0;
    }
  }

  return ret;
}

long double Func_exp::getLongDoubleVal(Row& row, FunctionParm& parm, bool& isNull,
                                       CalpontSystemCatalog::ColType&)
{
  // null value is indicated by isNull
  long double x = parm[0]->data()->getLongDoubleVal(row, isNull);
  long double ret = 0.0;

  if (!isNull)
  {
    errno = 0;
    ret = expl(x);

    if (errno == ERANGE)  // display NULL for out range value
    {
      if (x > 0)
      {
        isNull = true;
        Message::Args args;
        args.add("exp");
        args.add((double)x);
        unsigned errcode = ERR_FUNC_OUT_OF_RANGE_RESULT;
        throw IDBExcept(IDBErrorInfo::instance()->errorMsg(errcode, args), errcode);
      }
      else
        ret = 0.0;
    }
  }

  return ret;
}

}  // namespace funcexp
